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Plastic food containers storing leftovers, linked to microplastic exposure from food storage.

How to Reduce Microplastics in Food: Tea Bags, Coffee Cups & Takeaway

9 min read

Plastic exposure through food is not only about lunchboxes and water bottles. It can also come from the tea bag steeped in boiling water each morning, the disposable coffee cup used on the school run, leftovers reheated in a plastic tub, or hot takeaway food sitting in packaging on the journey home.

That does not mean you need to throw away your kitchen, stop ordering food to go or panic about every packaged meal. Food-contact materials are regulated in the UK, and research into the health effects of microplastics is still developing.

But there are a few situations where heat, direct food contact and daily repetition overlap. Those are the moments where a small change can be especially practical.

The goal is not perfection. It is to reduce the repeat exposures that are easiest to change.

How can you reduce microplastics in food and drinks?

The most useful place to start is with food and drink that touches plastic when it is hot, oily, acidic or repeatedly reheated.

Move leftovers onto a ceramic plate, glass bowl or saucepan before reheating.
Choose loose tea or tea bags clearly labelled plastic-free.
Use a reusable cup for hot takeaway drinks.
Transfer hot takeaway food onto a plate or bowl when you get home.
Replace scratched, warped or cloudy food tubs gradually as they wear out.
Keep bottled drinks out of hot cars and direct sunlight.

These changes are not expensive. Most use things you already own.

The Food Swap Barometer: what should you change first?

We ranked these swaps using four factors: how often they are used, whether they touch food or drink directly, whether heat or wear is involved, and how easy the change is to make.

Hidden source	What research suggests	Easy swap	Ease
Reheating leftovers in plastic	Microwave heating increases micro- and nanoplastic release compared with room-temperature storage or refrigeration.	Move food onto a ceramic plate, glass bowl or saucepan before reheating.	★★★★★
Plastic tea bags	One plastic tea bag releases billions of particles during brewing.	Use loose tea with a stainless-steel infuser, or choose tea bags clearly labelled plastic-free.	★★★★★
Disposable coffee cups	Paper cups have plastic-based linings. Studies have found particle release from some disposable cups exposed to hot water.	Keep a reusable cup near your keys, bag or laptop.	★★★★★
Hot takeaway packaging	Hot, oily or saucy food can sit directly against plastic packaging for the journey home.	Transfer food onto a plate or into a bowl when it arrives.	★★★★☆
Cling film on warm food	It creates direct food contact that is easy to avoid, especially with warm leftovers and oily dishes.	Cover bowls with a plate, lid or reusable wrap instead.	★★★★★
Scratched plastic food tubs	Wear, repeated washing and heating can stress plastic surfaces.	Replace scratched, warped or cloudy tubs gradually as they wear out.	★★★★★
Plastic chopping boards	Knife marks can shed plastic particles directly into food during normal use.	Replace heavily scarred boards with wood when they need replacing.	★★★★★
Plastic kitchen sponges	Conventional dish sponges can shed micro- and nanoplastics during use, particularly from abrasive layers.	Switch to a plant-based cellulose sponge and let it dry between uses.	★★★★★
Black plastic food trays and utensils	Black plastic may have flame retardants linked to recycled electronic plastics.	Choose alternatives where easy, especially for hot food.	★★★★★
Cans and packaged food	Many cans use polymer-based linings to protect food and prevent corrosion.	Mix in fresh, frozen, dried or jarred foods where practical.	★★★☆☆

Do tea bags release microplastics into tea?

Very likely.

Pyramid-shaped, silky or mesh-like tea bags are often made from nylon, PET or other plastic-based materials. What people don't realise is that the paper-looking teabags are often use plastic-based sealing materials or other additives in their construction. A 2019 study by researchers at McGill University found that steeping one plastic tea bag at brewing temperature released approximately 11.6 billion microplastic particles and 3.1 billion nanoplastic particles into a cup.

Tea is still a useful place to begin because it is such a repeated habit. A small change made every morning can add up over time.

What to do today: Check the tea you use most often. Replace silky, mesh-like or pyramid bags first with loose tea and a stainless-steel infuser, or a brand that clearly confirms plastic-free tea bags.

Do disposable coffee cups release plastic into hot drinks?

Many disposable coffee cups look like paper, but they are rarely paper alone.

Most are lined with a thin plastic-based coating to prevent leaks, while the lid is usually plastic. Studies have found that some disposable cups can release particles when exposed to hot water, although the amount varies widely depending on the cup, lining, temperature and testing method.

This does not mean you need to give up takeaway coffee. It means the daily coffee run is one of the easiest repeat habits to change.

What to do today: Put a reusable cup beside your keys, handbag or work bag. The cup you remember is more useful than the cup with the best design.

Does heating food in plastic release more particles?

Research suggests that heating can increase release of plastic particles in some food-contact products.

A 2023 study of plastic food containers and reusable food pouches found that microwave heating produced the highest release of micro- and nanoplastics compared with refrigeration or room-temperature storage. Separate research has also found that chemicals can migrate from microwavable plastic food-contact materials into food during heating.

This is not about one reheated lunch. It is about the container used several times a week, the children’s leftovers reheated in the same tub, or the takeaway tray placed straight into the microwave because it is convenient.

You do not need to throw away every storage container. Use good-condition tubs for cold storage where practical. The easiest adjustment is simply to avoid heating food in them.

What to do today: Make one rule: plate first, microwave second.

Is hot takeaway food in black plastic a concern?

Hot takeaway food is one of the most overlooked food-contact moments: food is often hot, oily or saucy, and can sit directly against packaging from the restaurant to your home.

Black plastic deserves additional scrutiny. A 2024 study of black plastic household products sold in the United States found flame retardants in some products, including kitchen and food-contact items. The researchers suggested that recycled electronic plastics may be entering consumer-product supply chains.

This does not prove that every black takeaway tray contains those substances, and the study was not a survey of UK takeaway packaging. But it is a sensible reminder that colour alone does not tell consumers what is in a material.

The practical answer is straightforward: transfer hot food out of its container when you get home, and never reheat it in the original tray.

Move curries, noodles, pasta, fried food and saucy dishes onto a ceramic plate or into a glass bowl.
Choose restaurants using reusable containers, aluminium, bagasse or simple paper-based packaging where those options are available.
Do not assume “compostable” always means plastic-free; some compostable packs use coatings or plastic-like polymers for grease or water resistance.

What to do today: Treat takeaway as you would leftovers: plate first, reheat second.

Do canned foods contain microplastics or plastic linings?

Cans belong in this conversation, but they need a balanced explanation.

Many food and drink cans use polymer coatings or linings to protect the contents and prevent corrosion. In the UK, food-contact materials are regulated and must meet legal requirements before being placed on the market.

Canned food is not identical to hot food sitting in a plastic takeaway tray, and it would be misleading to treat every can as a major source of microplastics. Canned foods can be affordable, useful and nutritionally valuable cupboard staples.

A practical approach is variety. Where it is easy, rotate between canned, dried, fresh, frozen and jarred foods rather than relying on one packaging format for every meal.

What to do today: For foods you buy often, especially oily foods, try alternating between cans and another format rather than aiming for an all-or-nothing change.

Do plastic chopping boards shed microplastics into food?

Most likely.

Plastic chopping boards become visibly scarred because knives cut into the surface. A 2023 study estimated that plastic chopping boards could contribute millions of microplastic particles annually, although the real-world amount will differ by board material, use, knife pressure and cleaning habits.

There is no need to discard a functional board immediately. But a deeply furrowed board is a practical item to replace when the time comes.

What to do today: Look at the board you use most. If it is deeply scarred, choose a wooden replacement for your next household purchase.

Do plastic kitchen sponges shed microplastics?

They can. Conventional washing-up sponges are often made from polyurethane foam, nylon, polyester or other plastics. They are used directly on plates, cutlery, pans and food-preparation surfaces, then exposed to friction, detergent, hot water and repeated wear.

Researchers have identified micro- and nanoplastics released from everyday dish sponges, with the abrasive side of a sponge more likely to shed particles than the softer layer. That matters because a sponge is not just stored in a cupboard: it is repeatedly used on the surfaces and utensils that come into contact with food.

Many people try to “freshen” an old sponge by putting it in the dishwasher, soaking it in boiling water or microwaving it. But heat does not restore a worn plastic sponge. Microwaving a dry or damaged sponge can also create a fire risk, so it is not a safe way to extend its life.

A simpler option is to choose a plastic-free sponge from the start. Spruce Eco Sponges are made from plant-based cellulose and water, without synthetic foam, plastic mesh or added microplastics. They arrive compressed, expand with water and can be composted at the end of their useful life.

What to do today: Replace your next conventional sponge with our plant-based cellulose alternative, then let it dry fully between uses rather than trying to revive it with high heat.

What should you do with the plastic containers you already own?

Use them strategically rather than throwing everything away.

There is no need to clear out every lunchbox, tub or container in your cupboard. That would be expensive, wasteful and unrealistic. Instead, make worn items your first replacements.

Prioritise containers that are:

scratched
cloudy
warped
cracked
frequently microwaved
used for very hot food
washed repeatedly in hot dishwasher cycles

For future purchases, choose glass, ceramic or stainless steel for the jobs involving heat and repetition: reheating leftovers, storing soups and sauces, carrying hot food or drinking hot beverages.

Here are some practical and eco-friendly uses of plastic containers: Rather than throwing out your current collection of food containers, use them to store jewellery, LEGO, small toys, hair accessories, craft supplies, batteries or other household bits and pieces instead. That way, it gets a second life without continuing to come into contact with food or landing as ocean-bound non-recycled waste.

Can you remove all microplastics from food?

No. Microplastics are now widespread in the environment and food system, so complete avoidance is not realistic.

But you can reduce repeated, avoidable exposure with practical habits:

use a reusable cup for hot drinks
choose loose tea or confirmed plastic-free tea bags
do not microwave food in plastic
transfer takeaway food onto a plate
replace heavily worn food-contact plastics gradually

One small change, repeated every day, is more useful than an expensive kitchen reset that never lasts.

The one kitchen change to make this week

Do not heat food in plastic.

It is free, simple and can begin with your next meal. Move leftovers onto a plate before reheating. Take hot takeaway food out of the delivery tray. Use a ceramic dish, glass bowl or saucepan instead.

It is the kind of habit that becomes automatic quickly — and once it does, it no longer feels like effort.

Glossary

Food-contact material: Any material designed to touch food or drink, including containers, cup linings, lids, packaging and utensils.

Microplastics: Plastic particles generally smaller than 5 millimetres.

Nanoplastics: Much smaller plastic particles, commonly described as being below 1 micrometre.

Migration: The movement of substances from packaging or another food-contact material into food or drink.

Polymer lining: A thin plastic-based coating used inside products such as disposable cups and cans.

Plastic-free tea bag: A tea bag made without plastic mesh or plastic-based sealing materials. Check the brand’s current packaging information, as materials can change.